The sysfs_readdir function in the Linux kernel 2.6, as used in Red Hat Enterprise Linux (RHEL) 4.5 and other distributions, allows users to cause a denial of service (kernel OOPS) by dereferencing a null pointer to an inode in a dentry.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11233
http://www.ubuntu.com/usn/usn-510-1
http://www.ubuntu.com/usn/usn-509-1
http://www.ubuntu.com/usn/usn-508-1
http://www.securitytracker.com/id?1018289
http://www.securityfocus.com/bid/24631
http://www.redhat.com/support/errata/RHSA-2008-0089.html
http://www.debian.org/security/2007/dsa-1428
http://support.avaya.com/elmodocs2/security/ASA-2007-287.htm
http://secunia.com/advisories/28643
http://secunia.com/advisories/28033
http://secunia.com/advisories/27912
http://secunia.com/advisories/26651
http://secunia.com/advisories/26643
http://secunia.com/advisories/26289
http://secunia.com/advisories/25838
http://secunia.com/advisories/25771
http://rhn.redhat.com/errata/RHSA-2007-0488.html
http://lists.opensuse.org/opensuse-security-announce/2007-12/msg00001.html